了解如何使用产品密钥或数字许可证激活 Windows、检查激活状态，以及链接Microsoft 帐户。

Learn all you need to know about sharing your Microsoft 365 Family subscription benefits.

How to use the SUMIF function in Excel to add the values in a range that meet criteria that you specify.

Learn how to open, navigate, and troubleshoot File Explorer in Windows, with answers to common questions and support assistance.

When you use InPrivate tabs or windows, your browsing data isn't saved on your PC once you're done.

Find out how to access and modify cellular settings on your Windows PC with this official guide from Microsoft Support.

Master the art of Excel formulas with our comprehensive guide. Learn how to perform calculations, manipulate cell contents, and test conditions with ease.

Learn how to download and customize Windows Media Player. Get troubleshooting help and how-to information for Windows Media Player 12.

Contact Microsoft Support. What's new. Surface Pro; Surface Laptop; Surface Laptop Studio 2

Join Teams meeting with ease using our step-by-step guide. Learn how to join a Teams meeting via your calendar, a dial-in number, or on the web.